The structure and development of rifted midoceanic rises

Midoceanic rises can be divided into two categories: rifted and nonrifted. Rifted rises are characterized by a median valley, high relief, a thick second layer, and the presence of metamorphic and deep intrusive rocks. Rifted rises are believed to have slow spreading rates of less than 2 cm/year...

Sedimentation in the Gulf of Paria during the Holocene transgression; a subsurface acoustic reflection study

A subsurface acoustic reflection study has been carried out in the Gulf of Paria with an Edo UQN Echo-sounder and a Precision Graphic Recorder of The Alden Electronics and Impulse Recording Equipment Co., Inc. Using a very short ping length for maximum resolution, penetration below the bottom in excess of 0.03 sec (45 m) was commonly obtained in water depths up to 100 m...

The intersection between the Mid-Atlantic Ridge and the Vema Fracture zone in the North Atlantic

Near 11°N, the Mid-Atlantic Ridge is offset by the Verna Fracture. The hypothesis of sea-floor spreading has suggested that the fracture is a transform fault, and this has been confirmed by the first motion studies of recent earthquakes along the fracture. The fault zone is developed as a deep and narrow east-west trending through, bordered on the south side by a high and steep rocky wall representing an uplifted slice of crust...